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Wu, Zhengxing, Junzhi Yu, Jun Yuan, and Min Tan. "Analysis and verification of a miniature dolphin-like underwater glider." Industrial Robot: An International Journal 43, no. 6 (October 17, 2016): 628–35. http://dx.doi.org/10.1108/ir-03-2016-0095.
Purpose This paper aims to propose a novel design concept for a biomimetic dolphin-like underwater glider, which can offer the advantages of both robotic dolphins and underwater gliders to achieve high-maneuverability, high-speed and long-distance motions. Design/methodology/approach To testify the gliding capability of dolphin-like robot without traditional internal movable masses, the authors first developed a skilled and simple dolphin-like prototype with only gliding capability. The hydrodynamic coefficients, including lift, drag and pitching moment, are obtained through computational fluid dynamics method, and the hydrodynamic analysis in the steady gliding motion is also executed. Findings Experimental results have shown that the dolphin-like glider could successfully glide depending on the pitching torques only from buoyancy-driven system and controllable fins without traditional internal moveable masses. Originality/value A hybrid underwater glider scheme that combines robotic dolphin and glider is firstly proposed, shedding light on the creation of innovation gliders with maneuverability and durability.
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Du, Xiaoxu, and Lianying Zhang. "Analysis on energy consumption of blended-wing-body underwater glider." International Journal of Advanced Robotic Systems 17, no. 2 (March 1, 2020): 172988142092053. http://dx.doi.org/10.1177/1729881420920534.
As a new type of underwater observation platform, underwater glider is widely used in marine explorations and military surveys, and most gliders are powered by their own batteries whose capacities are limited. It is therefore necessary to analyze the energy consumption of underwater glider. In this article, the variation law of seawater density changing with depth is considered; based on the theory of rigid body dynamics, the motion model of blended-wing-body underwater glider is established; the energy consumption model of each component module is accounted by analyzing the energy consumption composition in the working process of blended-wing-body underwater glider; and the energy consumption under different navigation depths, different glide ratios, and different buoyancy adjustments regulation is simulated. The results demonstrate that as the glide depth is increased, the total energy consumption increases in a single cycle and decreases per gliding distance, leading to a smaller energy consumption ratio for the attitude adjustment module; on the other hand, as the buoyancy adjustment is increased, more energy is consumed in a single cycle and less energy is consumed per gliding distanced, resulting in a larger energy consumption ratio for the attitude adjustment module. As the glide ratio increases, the total energy consumption in a single cycle first increases and then decreases, while the energy consumption of per gliding distance and the energy consumption ratio of the attitude adjustment module are decreased.
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Ji, Dae-Hyeong, Jung-Han Lee, Sung-Hyub Ko, Jong-Wu Hyeon, Ji-Hyeong Lee, Hyeung-Sik Choi, and Sang-Ki Jeong. "Design and Analysis of the High-Speed Underwater Glider with a Bladder-Type Buoyancy Engine." Applied Sciences 13, no. 20 (October 16, 2023): 11367. http://dx.doi.org/10.3390/app132011367.
This study entailed the design and analysis of a 400 m class underwater glider operated by a bladder-type buoyancy engine. The underwater glider was designed for high-speed movement with a maximum velocity of 2 knots. The shape of the hull was designed to reduce water resistance using the Myring hull profile equation. The reliability was verified by performing simulations using resistance coefficients. The relationship between the control value of the ballast discharged from the buoyancy engine and the glider’s speed according to the path angle was analyzed. Further, the relationship between the optimal glide angle and the design control value of the ballast was derived, and the optimal glider speed was estimated accordingly. Based on the analysis results, a bladder-type buoyancy engine was developed, and the maximum speed of the tested underwater glider was measured via sea trials.
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Mohd Ali, Zurriati, Jasmine Demi Danny Jabing, and Zulhilmy Sahwee. "Fabrication of UiTM’s Energy Glider." JOURNAL OF APPLIED ENGINEERING DESIGN AND SIMULATION 3, no. 1 (March 29, 2023): 1–10. http://dx.doi.org/10.24191/jaeds.v3i1.56.
Glider is a fixed-wing aircraft which does not depend on the engine. A glider can fly for an extended period depending on the design and area of the lifting surface. Just like any other aircrafts, the design of wings is crucial to produce lift force to keep aircraft in the air. Gliders have long wings and is designed to be lightweight which allows it to have a high lift-to-drag ratio (L/D) to glide at a long distance. The maximum lift-to-drag ratio, 〖(L/D〗_max) can indicate how far the glider will glide as it is one of the most important performance parameters. This project aims to design, build, and fly an energy glider. Prior on the design of the energy glider, statistical analysis has been done by comparing data from many studies to aid in determining the initial values of the glider. Then, the general design of the energy glider has been decided during the preliminary design. To support the design decision made, ANSYS Fluent software has been used to study flow of air over KFm-5A aerofoil profile which has been chosen during the early stages of design. The model of the energy glider was then designed in CATIA V5 software with a wingspan of 1.52 m and fuselage length of 0.69 m. Lastly, flight test was conducted to achieve the project’s objective. During the flight test, the glider reached a ceiling height of approximately 300 m and obtained a velocity of 144 km/h. The analysis of the glider performance will be used as an aircraft data for future research.
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Orozco-Muñiz, Juan Pablo, Tomas Salgado-Jimenez, and Noe Amir Rodriguez-Olivares. "Underwater Glider Propulsion Systems VBS Part 1: VBS Sizing and Glider Performance Analysis." Journal of Marine Science and Engineering 8, no. 11 (November 14, 2020): 919. http://dx.doi.org/10.3390/jmse8110919.
The Variable Buoyancy System (VBS) is a critical device in the operation of underwater gliders that should be properly sized to achieve the required vehicle propulsion; safety within the operating range; and adequate efficiency at the nominal depth rating. The VBS budget volume depends mainly on the glider hydrodynamics and the main operating states of the vehicle. A method is proposed with analytical equations to analyze the performance of underwater gliders and to estimate the resultant velocities of the vehicle as a function of the buoyancy change and the glider angle. The method is validated to analyze the glider performance of underwater gliders and is essential to get the main design requirement for the propulsion system: the VBS budget volume. The paper presents the application of the method to obtain the VBS sizing for an academic glider; a comparison with the historical hydrodynamic data of the Slocum glider; the results of the glider performance study; and the development of the characteristic charts necessary to evaluate the performance of the vehicle and its flight parameters.
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Rudnick, Daniel L., Russ E. Davis, and Jeffrey T. Sherman. "Spray Underwater Glider Operations." Journal of Atmospheric and Oceanic Technology 33, no. 6 (June 2016): 1113–22. http://dx.doi.org/10.1175/jtech-d-15-0252.1.
AbstractOperational statistics for the Spray underwater glider are presented to demonstrate capabilities for sustained observations. An underwater glider is an autonomous device that profiles vertically by changing buoyancy and flies horizontally on wings. The focus has been on sustained observations of boundary currents to take advantage of the glider’s small size, which allows it to be deployed and recovered from small vessels close to land, and the fine horizontal resolution delivered by the glider, which is scientifically desirable in boundary regions. Since 2004, Spray underwater gliders have been deployed for over 28 000 days, traveling over 560 000 km, and delivering over 190 000 profiles. More than 10 gliders, on average, have been in the water since 2012. Statistics are given in the form of histograms for 297 completed glider missions of longer than 5 days. The statistics include mission duration, number of dives, distance over ground, and horizontal and vertical distance through water. A discussion of problems, losses, and short missions includes a survival analysis. The most extensive work was conducted in the California Current system, where observations on three across-shorelines have been sustained, with 97% coverage since 2009. While the authors have certain advantages as developers and builders of the Spray underwater glider and Spray may have design and construction advantages, they believe these statistics are a sound basis for optimism about the widespread future of gliders in oceanographic observing.
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Yang, Canjun, Shilin Peng, and Shuangshuang Fan. "Performance and Stability Analysis for ZJU Glider." Marine Technology Society Journal 48, no. 3 (May 1, 2014): 88–103. http://dx.doi.org/10.4031/mtsj.48.3.6.
AbstractUnderwater gliders provide an effective, low-cost method for sampling the ocean over large spatial and temporal scales. In this paper, we present a series of theoretical analyses to provide guidelines for vehicle design, which are used to develop a coastal 200-m-depth underwater glider known as the Zhejiang University (ZJU) glider. The ZJU glider uses a longitudinally actuated moving mass for pitch control and a rudder for turning control. Computational methods and analytical approaches are chosen to solve the viscous and inviscid terms of glider hydrodynamics, respectively. Steady flight equilibrium analysis gives the varied range of moving mass location for pitch control and varied vehicle volume for buoyancy control. Size analysis investigates the effects of glider geometric parameters on motion performance. For wings-level flight, we describe the variation in the maximum lift-to-drag ratio corresponding to a given vehicle size and speed. For turning motion, we investigate the manner in which the turning performance varies with vertical rudder configuration. Stability analysis determines the relationship between the stability of glider motion and the locations of the glider wings and rudder. Pool trials indicate that the ZJU glider functions well in water and is capable of serving as a sensor platform for ocean sampling.
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Beer, Randall D. "The Cognitive Domain of a Glider in the Game of Life." Artificial Life 20, no. 2 (April 2014): 183–206. http://dx.doi.org/10.1162/artl_a_00125.
This article examines in some technical detail the application of Maturana and Varela's biology of cognition to a simple concrete model: a glider in the game of Life cellular automaton. By adopting an autopoietic perspective on a glider, the set of possible perturbations to it can be divided into destructive and nondestructive subsets. From a glider's reaction to each nondestructive perturbation, its cognitive domain is then mapped. In addition, the structure of a glider's possible knowledge of its immediate environment, and the way in which that knowledge is grounded in its constitution, are fully described. The notion of structural coupling is then explored by characterizing the paths of mutual perturbation that a glider and its environment can undergo. Finally, a simple example of a communicative interaction between two gliders is given. The article concludes with a discussion of the potential implications of this analysis for the enactive approach to cognition.
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Sun, Weicheng, Wenchuan Zang, Chao Liu, Tingting Guo, Yunli Nie, and Dalei Song. "Motion Pattern Optimization and Energy Analysis for Underwater Glider Based on the Multi-Objective Artificial Bee Colony Method." Journal of Marine Science and Engineering 9, no. 3 (March 16, 2021): 327. http://dx.doi.org/10.3390/jmse9030327.
Underwater gliders are prevailing in oceanic observation nowadays for their flexible deployment and low cost. However, the limited onboard energy constrains their application, hence the motion pattern optimization and energy analysis are the key to maximizing the range of the glider while maintaining the acceptable navigation preciseness of the glider. In this work, a Multi-Objective Artificial Bee Colony (MOABC) algorithm is used to solve the constrained hybrid non-convex multi-objective optimization problem about range and accuracy of gliders in combination with specific glider dynamics models. The motion parameters Pareto front that balances the navigational index referring to range and preciseness are obtained, relevant gliding profile motion results are simulated simultaneously, and the results are compared with the conventional gliding patterns to examine the quality of the solution. Comparison shows that, with the utilization of the algorithm, glider voyage performance with respect to endurance and preciseness can be effectively improved.
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bin Ibrahim, Mohamad Faizul, Ovinis Mark, and Kamarudin bin Shehabuddeen. "An Underwater Glider for Subsea Intervention: A Technical Feasibility Study." Applied Mechanics and Materials 393 (September 2013): 561–66. http://dx.doi.org/10.4028/www.scientific.net/amm.393.561.
An underwater glider is a type of autonomous underwater vehicle that moves based on small changes in its buoyancy, maneuvering using it wings as it glides through the water. These gliders, currently used in oceanographic sampling, may potentially be used to deliver payloads for subsea intervention at a lower net transport economy (NTE). Net transport economy, is a measure of the cost of transport in terms of the energy consumed per meter traveled, for each kilogram of loaded mass in air or net buoyancy underwater. The current method of payload delivery is either by using customized support vessel or remotely operated vehicle. This paper presents a technical feasibility study of extending the use of these gliders for subsea intervention, with emphasis on payload delivery. Important aspects of an underwater glider such as its volume (size), speed, wing area, wing span, operational depth and net transport economy were considered. The analysis was based on mathematical models governing existing gliders such as legacy gliders and the XRAY Liberdade. The results obtained were validated by extrapolating the present state of the art in underwater gliders to the proposed future use of these gliders, which is for payload delivery. In conclusion, the use of underwater gliders for subsea intervention is feasible based on factors considered in this study.
Dissertations / Theses on the topic "Glider analysis":
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Meyers, Luyanda Milard. "Analysis of lift and drag forces on the wing of the underwater glider." Thesis, Cape Peninsula University of Technology, 2018. http://hdl.handle.net/20.500.11838/2715.
Thesis (Master of Engineering in Mechanical Engineering)--Cape Peninsula University of Technology, 2018. Underwater glider wings are the lifting surfaces of unmanned underwater vehicles UUVs depending on the chosen aerofoil sections. The efficiency as well as the performance of an underwater glider mostly depends on the hydrodynamic characteristics such as lift, drag, lift to drag ratio, etc of the wings. Among other factors, the geometric properties of the glider wing are also crucial to underwater glider performance. This study presents an opportunity for the numerical investigation to improve the hydrodynamic performance by incorporating curvature at the trailing edge of a wing as oppose to the standard straight or sharp trailing edge. A CAD model with straight leading edge and trailing edge was prepared with NACA 0016 using SolidWorks 2017. The operating conditions were setup such that the inlet speed varies from 0.1 to 0.5 m/s representing a Reynolds number 27.8 x 10ᵌ and 53 x 10ᵌ.
The static pressure at different angles of attack (AOA) which varies from 2 to 16degrees at the increment of 2degrees for three turbulent models (K-Ԑ-standard, K-Ԑ-RNG and K-Ԑ-Realizable), was computed for upper and lower surfaces of the modified wing model using ANSYS Fluent 18.1. Thereafter the static pressure distribution, lift coefficient, drag coefficient, lift to drag ratio and pressure coefficient for both upper and lower surfaces were analysed. The findings showed that the lift and drag coefficient are influenced by the AOA and the inlet speed. If these parameters change the performance of the underwater glider changes as depicted by figure 5.6 and figure 5.7. The hydrodynamics of the underwater glider wing is optimized using the Cʟ/Cᴅ ratio as function of the operating conditions (AOA and the inlet speed). The investigation showed that the optimal design point of the AOA of 12 degrees and a corresponding inlet speed of 0.26m/s. The critical AOA matched with the optimal design point AOA of 12 degrees. It was also observed that Cp varies across the wing span. The results showed the Cp is higher closer to the fuselage while decreasing towards the mid-span and at the tip of the wing. This showed that the wing experiences more stress close to the fuselage than the rest of the wing span which implies that a higher structural rigidity is required close to the fuselage. The results of the drag and lift curves correspond to the wing characteristics typical observed for this type of aerofoil.
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Barker, William P. "An Analysis of Undersea Glider Architectures and an Assessment of Undersea Glider Integration into Undersea Applications." Thesis, Monterey, California. Naval Postgraduate School, 2012. http://hdl.handle.net/10945/17320.
Currently, buoyancy driven underwater gliders are deployed globally to gather oceanographic data from across the worlds oceans. This thesis examines the utility of underwater gliders within the context of providing additional U.S. Navy capabilities. An extensive survey of available underwater gliders was undertaken and the resultant survey pool of ten gliders down selected to five gliders of fixed wing configuration. A comprehensive architectural analysis was then conducted of seven key architectural attributes of the five selected gliders. The architectural analysis compared various implementations of the key architectural attributes relative to desirable traits and capabilities for a notional U.S. Navy glider. Following the architectural analysis a proposed architecture for a U.S. Navy underwater glider was developed which includes a compendium of best features gleaned from the architectural analysis. Drivers and rationale for selection of specific key architectural attributes and features are also provided. Additionally, a comparison of constraints and capabilities of underwater gliders is provided. Finally, a comparison of the current and proposed capabilities of underwater gliders versus other Autonomous Undersea Vehicles, specifically Unmanned Undersea Vehicles, is proffered.
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Rossouw, Pieter Stephanus. "The flutter analysis of the JS1 glider / P.S. Rossouw." Thesis, North-West University, 2007. http://hdl.handle.net/10394/1944.
De, Bruyn Jan Adriaan. "A preliminary theoretical flutter analysis of the JS1 glider / J.A. de Bruyn." Thesis, North-West University, 2004. http://hdl.handle.net/10394/475.
A preliminary theoretic flutter analysis of the new JS1 18m-class glider was performed
by means of analytic methods. This analysis consisted of a detailed modal analysis
using finite element modelling followed by the flutter prediction.
The modal analysis was computed with the aid of the commercial FE-code ANSYS in
which a model of the complete glider was generated. This model was created in such a
way as to effectively simulate the composite characteristics, while also ensuring that the
results were easily extractable for flutter prediction input. By using the Block-Lanczos
method, the 1st, 2nd, and 3rd main wing bending and torsion modes as well as the T-tail
configuration modes were all extracted in the frequency range from 0 - 30 Hz. These
modal results, which included the natural frequencies, mode shapes and displacements
were then used as the input for the flutter code.
The flutter prediction was done with the software code SAF (Subsonic Aerodynamic
Flutter). This prediction made use of a complete panel model for the glider, while the
flutter algorithm was solved with the p-k method. The flutter results, in the form of V-g
and V-f graphs, all showed main mode stability over the entire velocity range of 1.2V,
up to an altitude of 25000 ft. Thesis (M.Ing. (Mechanical Engineering))--North-West University, Potchefstroom Campus, 2005.
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Perez, Sancha David. "CFD analysis of a glider aircraft : Using different RANS solvers and introducing improvements in the design." Thesis, Linköpings universitet, Mekanisk värmeteori och strömningslära, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-159995.
In this study, Computational Fluid Dynamics (CFD) simulations have been carried out in order to investigate and improve the performance of the Standard Cirrus glider, using different Navier-Stokes methods and solving the equations for the steady flow. The work has been divided in two parts: First, a study is performed to test the quality of the transition model (Gamma-ReTheta). The two dimensional results of the glider´s airfoil are compared against the results from panel’s methods and the open-source CFD codes: SU2 and OpenFoam. In addition, three dimensional glider´s models are simulated using the transition model with the purpose of creating a validated reference model of the glider’s performance in steady level flight. The simulations are carried out in two dimensions for the outer wing airfoil for a 1.5 e+06 Reynolds number and in three dimensions for the Wing & Fuselage model and Tail & Fuselage model under a range of velocities. Both simulations are validated against experimental data. In the second part of the study, the validated model is used to developed possible improvements in the glider´s external geometry that could produce possible benefits in the performance and handling qualities of the glider.
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Browne, Keith R. J. "The instrumentation and initial analysis of the short-term control and stability derivatives of an ASK-I3 glider." Thesis, Stellenbosch : University of Stellenbosch, 2004. http://hdl.handle.net/10019.1/3631.
Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2004.
220 leaves single printed pages ,preliminary pages i-xiv and numberd pages 1-188.Includes bibliography.list of figures and used a Hp Scanjet 8250 Scanner to pdf format (OCR), ENGLISH ABSTRACT: This thesis describes the process followed to determine the short-term control and stability
derivatives of an ASK-13 glider (ZS-GHB). The short-term control and stability derivatives are
obtained by parameter estimation done using data recorded in flight. The algorithm used is the
MMLE3 implementation of a maximum likelihood estimator.
To collect the flight data sensors were installed in the ZS-GHB. Sensors measuring the
control surface deflections, translation acceleration, angular rates and the dynamic and static
pressure are needed to provide enough data for the estimation. To estimate accurate derivatives
specific manoeuvres were flown by the pilot, to ensure that all the modes of the glider were
stimulated.
The results reveal that the control and stability derivatives estimated from the flight data are
not very accurate but are still suitable to be used in simulating the glider's motion. AFRIKAANSE OPSOMMING: Hierdie tesis beskryf die proses wat gebruik is om die kort periode beheer en stabiliteit afgeleides
van 'n ASK-13 sweeftuig vas te stel. Die kort periode beheer en stabiliteit afgeleides is
verkry deur parameter afskatting op data wat gedurend vlugte van die sweeftuig opgeneem is.
Die algoritme wat gebruik is om die parameters af te skat is die MMLE3 voorstelling van 'n
maksimale moontlikheid afskatter.
Om vlug data te versamel sensore moes in die sweeftuig geinstalleer word. Die sensore meet
beheer oppervlak hoeke, versnellings, hoeksnellhede en die dinamies en statiese lugdruk om te
verseker dat daar genoeg data is vir die afskatting. Om die afgeskatte parameters akkuraad te
kry moet die loods spesefieke manoeuvres vlieg om seker te maak dat al die moduse van die
sweeftuig is gestimuleer.
Die resultate wat gelewer is 'n stel kort periode beheer en stabiliteit afgeleides wat nie
akkuraad is nie, maar wat weI goed genoeg is or ie bewegings van die sweeftuig te simuleer.
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Browne, Keith R. J. "The instrumentation and initial analysis of the short-term control and stability derivatives of an ASK-13 glider /." Link to the online version, 2004. http://hdl.handle.net/10019.1/3631.
Freisleben, Michal. "Výpočet zatížení a pevnostní kontrola křídla kluzáku." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228533.
Malinowski, Matěj. "Aerodynamická analýza měnitelné geometrie wingletu pro aplikaci na výkonném kluzáku." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318705.
Diplomová práce se zabývá aerodynamickou analýzou a optimalizací wingletu kluzáku. Winglet je uvažován s možností změny tvaru v průběhu letu a optimalizační proces je zaměřen na odhalení optimálních tvarů v odlišných letových režimech. První část práce popisuje současné snahy v oblasti návrhu a vývoje wingletů s měnitelnou geometrií. Druhá část je zaměřena na popis funkce wingletu, následována třetí částí, která popisuje optimalizační metody, které mohou být použity během optimalizace. Další částí práce je popis letadla vybaveného wingletem, který byl vybrán pro optimalizaci. Tato část je následována požadavky stavebního předpisu kategorie letadla, které bylo vybráno. Následuje model typického letu tohoto letadla. Zbytek práce je organizován dle procesu hledání optimálních tvarů wingletu. Popis tvorby CAD modelu je následován popisem tvorby CFD modelu a popisem přípravy CDF simulací. V předposlední kapitole jsou odhaleny detaily optimalizačního procesu. Závěrečná část práce obsahuje vyhodnocení výsledků optimalizačního procesu.
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Kóňa, Marián. "Aerodynamický návrh transsonického bezpilotního kluzáku." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232008.
This master thesis is focused on aerodynamic design of transonic glider, which is assigned for following an airliner at cruising regime of flight. Main goal of the thesis is to determine basic geometrical design of airplane with respect to Whitcomb aera rule, mass analysis and drag polar. Weight analysis includes determining center of gravity according to longitudinal static stability margin. The drag polar of the airplane is determine for cruising regime of flight, that means the regime of following an airliner.
United States. National Aeronautics and Space Administration., ed. SEADYN analysis of a tow line for a high altitude towed glider: Under contract NAS3-27186. [Washington, DC: National Aeronautics and Space Administration, 1996.
National Aeronautics and Space Administration (NASA) Staff. Seadyn Analysis of a Tow Line for a High Altitude Towed Glider. Independently Published, 2018.
Hout, Katherine. Exceptions to Hiatus Resolution in Mushunguli (Somali Chizigula). Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780190256340.003.0017.
Mushunguli (Somali Chizigula, Kizigua; ISO [xma]) is an endangered, under-described Bantu language spoken in the Lower Jubba River area of Somalia and in U.S. diaspora communities. This chapter presents a set of exceptions to hiatus resolution in Mushunguli. Hiatus is usually resolved in one of three ways: glide formation, whereby prevocalic high vowels i,u become glides j,w; fusion, whereby the low central vowel a fuses with the following vowel; and deletion, whereby sequences of identical vowels are reduced to a single short vowel. A set of high vowel-initial stems resolve hiatus normally in contexts where glide formation and deletion are expected, but fail to do so in contexts where fusion is expected. A clear, concise derivational analysis of these data is presented, with the aim of offering a useful benchmark for future research into hiatus resolution and phonological exceptionality.
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Gibson, Mark, and Juana Gil, eds. Romance Phonetics and Phonology. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198739401.001.0001.
The research in this volume addresses several recurring topics in Romance Phonetics and Phonology with a special focus on the segment, syllable, word, and phrase levels of analysis. The original research presented in this volume ranges from the low-level mechanical processes involved in speech production and perception to high-level representation and computation. The interaction between these two dimensions of speech and their effects on first- and second-language acquisition are methodically treated in later chapters. Individual chapters address rhotics in various languages (Spanish, Italian, and Brazilian Portuguese), both taps and trills, singleton and geminate; vowel nasalization and associated changes; sibilants and fricatives, the ways in which vowels are affected by their position; there are explorations of diphthongs and consonant clusters in Romanian; variant consonant production in three Catalan dialects; voice quality discrimination in Italian by native speakers of Spanish; mutual language perception by French and Spanish native speakers of each other’s language; poetry recitation (vis-à-vis rhotics in particular); French prosodic structure; glide modifications and pre-voicing in onsets in Spanish and Catalan; vowel reduction in Galician; and detailed investigations of bilinguals’ language acquisition. A number of experimental methods are employed to address the topics under study including both acoustic and articulatory data; electropalatography (EPG), ultrasound, electromagnetic articulography (EMA).
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Marlink, Richard G., and Alison G. Kotin. Global AIDS Crisis. ABC-CLIO, 2004. http://dx.doi.org/10.5040/9798400657313.
The most authoritative account published to date on the history, spread, and chilling repercussions of one of the deadliest pandemics the world has ever seen. Global AIDS Crisisscrutinizes the scourge of HIV and the AIDS virus throughout the world through the eyes of one of the top AIDS researchers in the world. From Botswana and sub-Saharan Africa to Thailand, Romania, and Brazil, an exploration of developing countries with limited access to healthcare and scarce resources reveals how such factors as tourism, international travel, war, and mobility have facilitated the insidious spread of HIV and AIDS. Candid discussions of sensitive issues such as stigma and its effects on morale and health complement scientific and medical inquiries into the origins of the disease and the development of antiretroviral therapies. An analysis of groundbreaking solutions such as "medication adherence partners," prevention strategies, and current vaccine models adds a glimmer of hope to a seemingly hopeless crisis.
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Wolodzko, Agnieszka. Affect as Contamination. Bloomsbury Publishing Plc, 2023. http://dx.doi.org/10.5040/9781350333031.
Bringing the concept of contamination into dialogue with affect theory and bioart, Agnieszka Anna Wołodźko urges us to rethink our relationship with ourselves, each other and other organisms. Thinking through the lens of contamination, this book provides an innovative approach to understanding the leaky, porous and visceral nature of our bodies and their endless interrelationships and, in doing so, uncovers new ways for thinking about embodiment. Affect theory has long been interested in transmission or contagion but, inspired by Spinoza and Deleuze, Affect as Contamination goes further, as contamination is concerned with the materiality of bodies and their affective encounter with other matter. This brings urgency to the notion of affect, not only for bioart that works with risky bodies but also for understanding how to practise our bodies in the age of biotechnological manipulation and governance. Using challenging and transgressive bioart projects as provocative case studies for rethinking affect and bodily practice, Wołodźko follows various ‘contaminants’ from blood, hormones and viruses - including COVID-19 - to food, glitter and plants. This takes the form of both personal accounts of encounters with the contaminations of bioart and critical analyses of aesthetic, material and technical objects, with each one highlighting in different ways the risky and uncertain nature of contamination. Affect as Contamination is an urgent and original meditation on just what it means to be living, and practising our bodies, in an era where biotechnology contaminates all aspects of our lives.
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Johnson, Gail. Research Methods for Public Administrators. Praeger, 2002. http://dx.doi.org/10.5040/9798216007869.
Without jargon or mathematical theory to hinder a quick understanding and use, here are the research tools and techniques you can grasp and immediately apply to obtain research services from others or do research yourself. Johnson makes clear that to succeed in any public agency management position, you have to be able to think analytically and know how to assess the quality of research results. By providing the underlying concepts and just enough methodology to operationalize them, she gives you exactly what you need—in a clear, straightforward way that takes the fear out of learning. You will find here an especially wide range of practical guidelines and examples, all from the author's own and others' experiences in a variety of settings within the public sector. Throughout her book she emphasizes the how of research—how to do it, how to make sense of its findings—and covers all the basic statistical tools, concetrating steadily on interpreting research results. An important, reader-friendly text for students of public administration, and for their often perplexed colleagues already on the job. Johnson explains that public administrators do not do research themselves all that often. But with the rising demand for results measurement, balancing scorecards, benchmarking and assessing customer satisfaction, they do need to understand the basics of what research is and at least have more than just a glimmer of how it is done. Her book offers both—a simple, easily grasped presentation of research concepts and principles, plus all of the essentials of doing program evaluation, policy analysis, and applied social science. It is especially useful as a text in such courses as research methods, program evaluation and introduction to applied statistics, usually found in public administration programs at the undergraduate and graduate levels. And for people already in jobs outside the academic community, people who are now asked to do tasks that they seldom did before—and never expected they would be asked to do—it is essential.
Book chapters on the topic "Glider analysis":
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Chang, Dongsik, Wencen Wu, and Fumin Zhang. "Glider CT: Analysis and Experimental Validation." In Springer Tracts in Advanced Robotics, 285–98. Tokyo: Springer Japan, 2016. http://dx.doi.org/10.1007/978-4-431-55879-8_20.
Li, Xiao-tao, Fang Liu, Li Wang, and Hu-qing She. "Motion Analysis of Wave Glider Based on Multibody Dynamic Theory." In Intelligent Robotics and Applications, 721–34. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-65289-4_67.
Guo, Liming, Jing Liu, Guang Pan, Baowei Song, Yonghui Cao, Yong Cao, Yujun Liu, and Hengtai Ni. "Vibration Analysis of the Rudder Drive System of an Underwater Glider." In Proceedings of IncoME-VI and TEPEN 2021, 147–54. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-99075-6_13.
Sutton-Spence, Rachel. "The Hang Glider." In Analysing Sign Language Poetry, 168–82. London: Palgrave Macmillan UK, 2005. http://dx.doi.org/10.1057/9780230513907_11.
Melber-Wilkending, S., G. Schrauf, and M. Rakowitz. "Aerodynamic Analysis of Flows with Low Mach- and Reynolds-Number under Consideration and Forecast of Transition on the Example of a Glider." In New Results in Numerical and Experimental Fluid Mechanics V, 9–16. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/978-3-540-33287-9_2.
Wenzel, Horst, and Gottfried Heinrich. "Unendliche Reihen mit konstanten Gliedern." In Übungsaufgaben zur Analysis, 41–42. Wiesbaden: Vieweg+Teubner Verlag, 1987. http://dx.doi.org/10.1007/978-3-322-94555-6_14.
Wenzel, Horst, and Gottfried Heinrich. "Unendliche Reihen mit konstanten Gliedern." In Übungsaufgaben zur Analysis Ü 1, 41–42. Wiesbaden: Vieweg+Teubner Verlag, 1999. http://dx.doi.org/10.1007/978-3-663-07815-9_14.
Wenzel, Horst, and Gottfried Heinrich. "Unendliche Reihen mit konstanten Gliedern." In Übungsaufgaben zur Analysis Ü 1, 41–42. Wiesbaden: Vieweg+Teubner Verlag, 1997. http://dx.doi.org/10.1007/978-3-663-01427-0_14.
Brackett, John. "“Weed Crumbles into Glitter”." In The Routledge Companion to Popular Music Analysis, 300–314. New York: Routledge, 2018.: Routledge, 2018. http://dx.doi.org/10.4324/9781315544700-21.
Sobkowiak, Włodzimierz. "Hiatus-breaking glide insertion in English and Polish." In Further Insights into Contrastive Analysis, 255. Amsterdam: John Benjamins Publishing Company, 1991. http://dx.doi.org/10.1075/llsee.30.17sob.
Gao, Lei, Ran He, Yangge Li, and Zhiguo Zhang. "Analysis of Autonomous Underwater Gliders Motion for Ocean Research." In ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-24534.
Underwater gliders, a type of highly efficient underwater vehicle which uses gravity and buoyancy for propulsion, has been studied for a long time during the last 3 decades. This paper describes the development of the principle dynamic models of a general underwater glider, including hydrodynamic forces and buoyancy effects. The numerical analysis model was developed for the underwater glider motion. Dynamic forces equations including the model’s buoyancy, gravity, and hydrodynamic forces in gliding are derived. Gliding velocities with changes of the net buoyancy are compared. The numerical method was used to calculate the hydrodynamics coefficient of the glider. Dynamic characteristics of the Seaglider and SLOCUM have been used as validation objects for the numerical method. The glide angle is merely the function of the lift/drag ratio and has no relation to the net buoyancy. The gliding velocity would increase when the buoyancy increases.
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Nawaz Ahmad, Usman, and Yihan Xing. "UiS Subsea Freight-Glider: Controller Design and Analysis." In ASME 2022 41st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/omae2022-79448.
Abstract The UiS subsea freight-glider (USFG) is a novel 785 DWT large cargo-carrying underwater autonomous vehicle. It uses variable buoyancy propulsion, i.e., it glides forwards using generated lift and drag forces at the hydrofoils while ascending and descending in water. This propulsion method is ultra-efficient and can transport cargo over long distances with minimal energy consumption. For USFG to operate with maximum speed and enhanced range, a robust, reliable, and accurate control is important as this results in a precise navigation system that would allow for its gliding motion to be extremely efficient. During long-distance voyages, a robust control system based on a feedback loop provides enhanced utility against any external uncertainties or environmental disturbances. The purpose of this work is to implement a control methodology that is based on feedback from the model. This approach removes the need for excessive tuning of controllers for any changes in operating conditions. Moreover, dynamic states, i.e., velocities, can be determined by designing an observer which can be used to predict the motion of the USFG in a planar axis. The gliding paths of USFG in the vertical plane are analyzed along with the observability and controllability of the steady equilibrium glides. For this purpose, the control system is designed with two different controllers, PID and LQR, which control the heave and pitch of the vehicle. Finally, a comprehensive comparison study is presented, which highlights the key differences for the controllers for tunning and rise time. This can also help in designing the ideal control for the required application.
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Gánovský, Martin, and Branislav Kandera. "Enhancing safety in glider flights." In Práce a štúdie. University of Žilina, 2023. http://dx.doi.org/10.26552/pas.z.2023.2.20.
The theme of paper is to find out new possibilities in safety improvements during sailplanes flights, focusing primarily on flights when the separation with other traffic is reduced. At the beginning a summary of glider evolution across the centuries is made starting with the interwar period to the shapes that we know from the latest exhibitions. First part of the paper is followed by the analysis of the current available technical measurements which enhance safety and reduce the probability of in-flight collisions during various phases of flight, including latest and most modern technical implementations used by glider operators to enhance the safety of themselves and others. We will also look up for any available legislative rules based both on national civil authority regulations defined by state itself and for regulations that were created by Fédération Aéronautique Internationale (FAI) which covers most of glider competitions organized world-wide. In practical part we followed our thoughts about how to improve the current situation in this part of the aviation industry. In following steps, we decided to ask the glider pilots about their personal experience with reduced separation caused by nearby gliders during different phases of operations. Generally, there is a huge number of mid-air collisions during sailplane competitions and flight phases where pilots are crossing each other by minimal separation (mountain ridge flying). We decided to suggest minor legislative regulations and technical implementations to improve current situation world-wide and make these flights as safe as possible with minimizing of future incidents.
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Wang, Yijun, Yanhui Wang, and Zhigang He. "Bouyancy compensation analysis of an autonomous underwater glider." In Mechanical Engineering and Information Technology (EMEIT). IEEE, 2011. http://dx.doi.org/10.1109/emeit.2011.6022896.
Wang, Yijun, Yanhui Wang, and Zhigang He. "Bouyancy compensation analysis of an autonomous underwater glider." In Mechanical Engineering and Information Technology (EMEIT). IEEE, 2011. http://dx.doi.org/10.1109/emeit.2011.6023221.
Fu, Zhidong. "Aerodynamic analysis and design optimization of a hang glider." In 50th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2012. http://dx.doi.org/10.2514/6.2012-1074.
Wang, Chong, Zhihong Zhang, Jiannong Gu, Jubin Liu, and Tao Miao. "Design and Hydrodynamic Performance Analysis of Underwater Glider Model." In 2012 International Conference on Computer Distributed Control and Intelligent Environmental Monitoring (CDCIEM). IEEE, 2012. http://dx.doi.org/10.1109/cdciem.2012.59.
Yang, Lei, Junjun Cao, Junliang Cao, Baoheng Yao, Zheng Zeng, and Lian Lian. "Hydrodynamic and vertical motion analysis of an underwater glider." In OCEANS 2016 - Shanghai. IEEE, 2016. http://dx.doi.org/10.1109/oceansap.2016.7485413.
van Brummen, Sil, Giuseppe Pezzella, Giovanni Andreutti, Bodo Reimann, and Johan Steelant. "Aerodynamic Design Analysis of the Hexafly-INT Hypersonic Glider." In 20th AIAA International Space Planes and Hypersonic Systems and Technologies Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2015. http://dx.doi.org/10.2514/6.2015-3644.
The Atlantic Margin Model (AMM15) is one of the ocean models used by the Met Office, predicting ocean circulation in the North Atlantic approaches and shelf seas around the UK at a resolution of 1.5km. Model analyses and forecasts are used in a wide range of applications including search and rescue, oil spill response and providing sea-surface temperature boundary conditions for Met Office numerical weather prediction. The majority of observations used to constrain the AMM15 model are surface measurements collected by satellites. In situ and sub-surface observations of shelf seas around the UK are relatively sparse, for example because the North Sea’s limited area and the density of infrastructure means that the drifting surface buoys and Argo profiling floats we use for measuring the open ocean are unsuitable. In this environment, ocean gliders are the ideal observation instrument. Their ability to propel and steer themselves allows them to avoid infrastructure and to provide observations from a chosen area and depths. For this experiment, ocean gliders were deployed near the Shetland Isles and their observations were inserted into a trial AMM15 model. This trial was compared to a control AMM15 model (without glider data) and the differences between the two were studied. We observed that the gliders had a greater impact on the AMM15 model than anticipated, but their data overall increased the trial model’s accuracy. Glider data are now regularly assimilated into the operational AMM15 model.
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Hernandez-Lasheras, Jaime, Ali Aydogdu, and Baptiste Mourre. Intercomparison of glider assimilation in the different analysis and forecasting systems. EuroSea, 2023. http://dx.doi.org/10.3289/eurosea_d4.9.
The present deliverable is a continuation of deliverable D4.21, in which we presented the first steps in the design and preparation of different reanalysis simulations assimilating glider data. We here show the assessment and intercomparison of CMCC MedFS and SOCIB WMOP systems experiments. We have performed, for each system, three different experiments, running a one-year simulation during 2017. We compare a free-run simulation without data assimilation (FREE) and two reanalyses including assimilation: one considering only the generic data sources included in each operational system (NOGLID) and another one adding glider observations to the previous dataset (GLIDER). The models are assessed and inter compared to each other, focusing on the performance to represent the observed 3D structure of the ocean and on their capacity to recreate physical processes, as an anticyclonic eddy structure present in the Balearic sea. Results show how in both systems the use of glider observations can help to further improve the results obtained when using data assimilation, helping to an enhancement of the forecasting capabilities. (EuroSea Deliverable, D4.9)
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Drew, Benjamin A. Measurement Methods and Analysis: Forces on Underwater Gliders. Fort Belvoir, VA: Defense Technical Information Center, May 2002. http://dx.doi.org/10.21236/ada404481.
The accuracy of the Copernicus Marine Environment and Monitoring Service (CMEMS) ocean analysis and forecasts highly depend on the availability and quality of observations to be assimilated. In situ observations are complementary to satellite observations that are restricted to the ocean surface. Higher resolution model forecasts are required by users of the CMEMS global and regional ocean analysis and forecasts. To support this with an efficient observational constrain of the model forecast via data assimilation, an increase observation coverage is needed, associated with an improved usage of the available ocean observations. This work exploits the capabilities of operational systems to provide comprehensive information for the evolution of the GOOS. In this report, we analyse the use and the efficiency of the in-situ observations to constrain regional and global Mercator Ocean systems. Physical and biogeochemical variables are considered. The in-situ observations are used either to estimate physical ocean state at global and regional scale via data assimilation or to estimate BGC model parameters. The impact of the physical in situ observations assimilated in open ocean and coastal areas is assessed with numerical data assimilation experiments. The experiments are conducted with the regional 1/36° resolution and global 1/12° resolution systems operated by Mercator Ocean for the Copernicus Marine Service. For the global physical ocean, the focus is on the tropical ocean to better understand how the tropical mooring observations constrain the intraseasonal to daily variability and the complementarity with satellite observations and the deep ocean. The tropical moorings provide unique high frequency observations at different depth, but they are far away from each other, so part of the signal in the observation are decorrelated from one mooring to the others. It is only via an integrated approach, as data assimilation into a dynamical model and complementarity with other observing networks that those observations can efficiently constrain the different scales of variability of the tropical ocean circulation. As the satellite observations brings higher spatial resolution between the tropical moorings but for the ocean surface, we show that the tropical mooring and Argo profile data assimilation constrain the larger scale ocean thermohaline vertical structure (EuroSea D2.2; Gasparin et al., 2023). The representation of the high frequency signals observed at mooring location is also significantly improved in the model analysis compared to a non-assimilative simulation. The ocean below 2000 m depth is still largely under constrained as very few observations exist. Some deep ocean basins, as the Antarctic deep ocean, shows significant trend over the past decade but they are still not accurately monitored. Based on the spread of four deep ocean reanalysis estimates, large uncertainties were estimated in representing local heat and freshwater content in the deep ocean. Additionally, temperature and salinity field comparison with deep Argo observations demonstrates that reanalysis errors in the deep ocean are of the same size as or even stronger than the observed deep ocean signal. OSSE already suggested that the deployment of a global deep Argo array will significantly constrain the deep ocean in reanalysis to be closer to the observations (Gasparin et al., 2020). At regional and coastal scales, the physical ocean circulation is dominated by higher frequency, smaller scale processes than the open ocean which requires different observation strategy to be well monitor. The impact of assimilating high frequency and high-resolution observations provided by gliders on European shelves is analysed with the regional Iberic Biscay and Irish (IBI) system. It was found that repetitive glider sections can efficiently help to constrain the transport of water masses flowing across those sections. BGC ocean models are less mature than physical ocean models and some variable dependencies are still based on empirical functions. In this task, Argo BGC profile observations were used to optimize the parameters of the global CMEMS biogeochemical model, PISCES. A particle filter algorithm was chosen to optimize a 1D configuration of PISCES in the North Atlantic. The optimization of the PISCES 1D model significantly improves the model's ability to reproduce the North Atlantic bloom Recommendations on the in-situ network extensions for real time ocean monitoring are given based on those results, and the one also obtained in the WP2, Task 2.2 where data assimilation experiments but with simulated observations where conducted. Argo extension and the complementarity with satellite altimetry was also extensively studied. (EuroSea Deliverable ; D4.8)
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Noone, Emily, and Lydia Harriss. Hypersonic missiles. Parliamentary Office of Science and Technology, June 2023. http://dx.doi.org/10.58248/pn696.
This POSTnote looks at hypersonic missile technologies, efforts to develop them, potential applications, and the possible challenges they may present for missile defence and global stability. Key Points: • Hypersonic missiles combine speeds of over five times the speed of sound with significant manoeuvrability during flight. • Their manoeuvrability enables them to change trajectory during flight, making their flight-path and target difficult to predict. • They fly at lower altitudes than ballistic missiles, which means that they may be harder to track at long distances with some surface-based sensors, such as certain radar. • There are two main types of hypersonic missile: hypersonic glide vehicles (HGVs) and hypersonic cruise missiles (HCMs). • HGVs are mounted onto rocket boosters for launch and may be accelerated to speeds of Mach 20 or more. The glider then separates from the booster and flies unpowered in the Earth’s upper atmosphere at altitudes of 30-80 km, before diving towards the target. • HCMs typically have a ramjet or scramjet engine that enables them to reach hypersonic speeds at altitudes of 20-40 km. • China and Russia have reportedly deployed hypersonic missiles that could deliver conventional or nuclear weapons. The US is testing multiple hypersonic technologies. • The AUKUS agreement between the UK, US and Australia includes developing hyper-sonic and counter-hypersonic technologies. • Developing hypersonic missiles requires significant research and development challenges to be overcome, contributing to their high development and manufacturing costs. • The speed, manoeuvrability and altitude of hypersonic missiles may challenge existing missile defences, although their uses and effectiveness are still being assessed. • Defence analysts disagree about the potential implications of hypersonic missiles for global peace and stability. Some suggest they could increase the risk of conflict escalation, while others say that they will not alter the strategic balance between nuclear powers. • Arms control, export controls and other measures may help limit potential harm to peace and stability, but these approaches face challenges.
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Schofield, Oscar, Josh Kohut, and Scott Glenn. Resuspension during Storms: Deployment of Gliders as Part of the ONR-OASIS Effort and a Retrospective Analysis. Fort Belvoir, VA: Defense Technical Information Center, January 2006. http://dx.doi.org/10.21236/ada521742.
Cunningham, Stuart, Marion McCutcheon, Greg Hearn, Mark David Ryan, and Christy Collis. Australian Cultural and Creative Activity: A Population and Hotspot Analysis: Gold Coast. Queensland University of Technology, August 2020. http://dx.doi.org/10.5204/rep.eprints.203691.
The Gold Coast has one of the strongest and most resilient city brands in Australia. Monikers such as the ‘glitter strip’, ‘Sin City’, ‘Australia’s playground’ and ‘famous for fun’ have variously been applied to brand the Gold Coast, with its identity long touted as revolving around ‘sun, surf and sand’. Belinda McKay (2005, p. 68) observes that the Gold Coast is often seen as a place to escape to, ‘where new possibilities can be imagined and enacted’: this sense of escape from the ordinary remains a strong element of the Gold Coast’s place identity.
